I have painted up the first four of these, and have a bunch on the workbench, but wanted to give my first impressions...
The miniatures are well sculpted with good details. There are 5 or 6 variations in each pack. The sculpts are clean.
One of the most important questions though is how do the fit with other ranges. Well, they are a bit on the large size, though not too big. They are even larger than some of their own ranges. For instance in the picture below, on the far right is one of BV Frigian miniatures. There is a slight difference in height and bulk. In the middle I have an Old Glory 15mm Norman Archer, and on the left is a Barbarian from Copplestone Castings. The Copplestone Casting is smaller, but the picture is a bit deceptive because the spearman has a pretty large helmet!
Overall I would say that these would be a good addition to your 15mm collection. Battle Valor Games is constantly adding new figs, and is one of the better manufacturers of 15mm fantasy!
Here is the link to Heillians range at Battle Valor Games if you want to do some shopping! Battle Valor Games